This directory contains the compiled code for the Contiki energy estimation demonstration for ACM SenSys 2007. More information is available in the handouts/ directory and at the Contiki website: http://www.sics.se/contiki/ * INSTALLATION Cygwin and Java (JRE) needs to be installed. The demo has been tested on Microsoft Windows, but probably works under Linux too. You need between two and eight Tmote Sky boards to run the demo: one sink and between one and seven nodes. The nodes are numbered from 42 to 48, and 41 is the sink node. Step 1: Unpack the zip file unzip contiki-energest-demo.zip Step 2: Change directory to the demo directory cd contiki-energest-demo Step 3: Connect the sink node to the PC. Remove all other Tmote Sky nodes from the PC. Step 4: Upload Contiki to the sink: make upload-sink Step 5: Remove the sink node from the PC. Step 6: Connect one of the non-sink nodes to the PC Step 7: Upload Contiki to the node: make upload-node-42 Step 8: Remove the Tmote Sky from the PC. Step 9: Insert batteries into the Tmote Sky. The red LED should light up. Step 10: Repeat step 6 to step 9 for all non-sink nodes. Replace "make upload-node-42" with "make upload-node-43", "make upload-node-44", and so on. Step 11: Insert the sink node to the PC Step 12: Run the Java program: make rundemo NOTE: this uses the first Tmote Sky it finds as a sink. Therefore, make sure that only one Tmote Sky (the sink) is inserted. * DEMO DESCRIPTION Contiki continuously estimates the energy consumption of the system. In this demonstration, seven Tmote Sky nodes, running Contiki, estimates their energy consumption and send their power to a sink node. The sink node is connected to the PC, and reports the nodes' power to a Java program. The Java program shows the nodes' power consumption for the last second. When pushing the button on the nodes, they cycle through seven states as below. This is reflected by their power consumption, as shown in the Java program. The different states are: * Red LED: sending one packet per second * Green LED: radio listen 1% duty cycle * Green, red LEDs: radio listen 10% duty cycle * Blue LED: radio listen 100% * Blue, red LEDs: radio listen 10%, CPU low-power mode disabled * Blue, green LEDs: sending data 1.2 kilobytes/second * Blue, green, red LEDs: sending data 12 kilobytes/second When sending data, the radio is turned on for a while before the transmission to check if it is possible to send the packet. This is the reason why energy is spent on radio listening even when the nodes are only sending data.